1- Do you think it can be charged without problem with the original system?2- Do you have a better alternative?

Thanks for your help,JFonseca

Hi, The Motorcycles Charging System is not designed to Charge Ni-MH Batteries, also the Ni-MH battery packs cannot deliver enough amps to start the engine with the electric starter, Good idea, but no go, use the original lead acid or a gel cell battery designed for you Bike, and that will keep you out of Electrical Problems, Take care and have fun, Chellie

I may be getting Older, But I Refuse to grow Up I am Having to much Fun to Grow Up LOL

With the NiMH battery I would have 0,9Kg (vs 2,1Kg) and 6,9Ah (vs 6Ah)

Yup
With the Nih battery, you will have 0.9 Kg, a Honda Lead acid battery type charger circuit that will burn up the Nih battery (and maybe even the charger in your Honda) and a battery that will run your lights, but may not turn over the engine!

Those A123 cells, and some of those LiPo battery packs could easily do the job. Problem is, these cells absolutely have to have individual cell balancing circuitry, or they will have a short life. That would call for four series, four parallel connections of A123 cells for about 8 Amp hours. And a cost of $200, not counting the required balancing circuitry.

Yup
With the Nih battery, you will have 0.9 Kg, a Honda Lead acid battery type charger circuit that will burn up the Nih battery (and maybe even the charger in your Honda) and a battery that will run your lights, but may not turn over the engine!

Those A123 cells, and some of those LiPo battery packs could easily do the job. Problem is, these cells absolutely have to have individual cell balancing circuitry, or they will have a short life. That would call for four series, four parallel connections of A123 cells for about 8 Amp hours. And a cost of $200, not counting the required balancing circuitry.

Thanks for the reply.

It would be too easy to be true

So, no NiMH, no A123 (cost issue) and I have been left with only 2 options:
- OEM lead battery
- Lipo battery

Because of all the stories I have been told, and some incidents I have seen at my club, I am very afraid of using Lipos in my motorcycle. But there's some battery brands which state that they are safe, like WPS:

WPS featherweight:
Lithium Ion Polymer technology
All components are designed, manufactured, assembled and packed in one location assuring high quality and consistency
Extremely lightweight, 50% to 70% lighter than standard batteries
Built-in LED test gauge
Increased cranking amps over lead acid batteries
Fast recharge, can be brought up to 90% charge in within 6 minutes
Easily 6 to 12 times more cycle life compared to lead acid batteries
Long shelf life, up to 1 year before requiring recharging
Can be mounted in any position
No hazardous acid or heavy metals, non-explosive and noncombustible
No shipping restrictions!
More precise fitments compared to other brands of lithium batteries
1 Year warranty
Dimensions 6in. x 7/16in. x 3 11/16in.
C.C.A. 145

What do you think about their claims? Would you put it under you in a motorcycle?

On a bike, i wouldn't bother with either. I've had lead acid batteries last for 8 years, abd walmart cheepies have a 3 year warranty. if the lithium is so much better, then why only a one year warranty?

I wouldn't be worried about the capacity or chemistry of the battery, but i doubt you would get anymore life out of it, and it certantly wouldn't be cost effective. i seriously doubt its worth the cost, or hassle.

and this is coming from a guy that converted his automatic car to a manual for a job.